There are a number of alternatives, and they can run to some serious money. On another board I frequent, a member bought a Corbin and a Top Saddlrie at the same time..... he ended up deciding on keeping the Corbin, rather than the French seat. Sargent, TS, Corbin, all offer seats that will replace the OEM unit.
Yamaha sells the 'comfort' gell seat, another drop on replacement.....
The less expensive route is to take your seat to an upholstery shop, and have them replace your OEM foam with better quality material. If you have access to a custom seat shop, they'll do the same thing, except they will understand what is needed to make the seat work best on your motorcycle with your posterior on it.
Cheaper yet..... but the foam yourself, and use a bread knife to carve it to the shape you want. (take the OEM cover off the seat pan, and shape the new foam to the seat, then staple the OEM cover back on the seat, after you are happy.)